Apparatus for reclaiming matter discharged in the manufacture of pulp and paper.



' No- 881,383; I PATENTED MAR. 10, 1908.

J. M. DOHAN. APPARATUS FOR R'EOLAIMING MATTER DISGHARGBD' IN THEMANUFACTURE 0F PULP AND PAPER.

APPLIO TION FILED AUG.15 1 0 A 9 7 28HEETS-SHEET 1.

ATTORIVEK THE NORRIS PETERS co. wAsHmaroN. D. c.

No. 881,888. PATENTED MAR. 10, I908.

J. M.- DOHAN. APPARATUS FOR REOLAIMING MATTER DISGHAR-GED IN THEMANUFACTURE OF PULP AND PAPER. APPLICATION FILED AUG.15. 1907.

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WITNESS-E6:

INVENTUR A 77'0RNEY.

THE "alums PETERRO wAsHlncmN. n. c.

JOSEPH DOHAN, OF DARLINGTON, PENNSYLVANIA.

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APPARATUS FOR REOLAIMING MATTER DISCHARGED IN THE MANUFACTURE OF PUL?AND PAPER.

Specification of Letters Patent.

Application filed. August 15, 1907.

Patented March 10, 1908 Serial No. 388,582.

To all whom it may concern.

Be it known that I, JOSEPH M. DOHAN, a citizen of the United States,residing at Darlington, in the county of Delaware and State ofPennsylvania, have invented certain Apparatus for Reclaiming MatterDischarged in the Manufacture of Pulp and Paper, of which the followlngis a specification.

This invention is an apparatus for circulating and bafliing liquid toprecipitate solids therein with the object of reclaiming the water, pulpand other valuable constituents discharged in the manufacture of pulpand paper. To this endthe white water from the process of manufacture isflowed through baffling courses having means for setting up countercurrents and checking the rate of flow to effect the precipitation ofsolid matter and the separation of the clarified water therefrom, aseries of receptacles .being rovided for securing successivesedimentations and clarifications with storage so that both water andsolids canbe obtained in the condition desired.

The further characteristics of the improvements will appear from thefollowing description and the accompanying drawings in illustrationthereof.

In the drawings, Figure 1 represents a plan view of apparatus embodyingthe improvements, Fig. 2 represents a sectional view thereof taken onthe line 22 of Fig. 1, Fig. 3 represents a sectional view thereof takenon the line 33 of Fig. 1, and Fig. 4 represents a sectional view thereoftaken on the line 44 of Fig. 1.

The apparatus, as illustrated, comprises the tanks A, B, and C arrangedso that the liquid may pass through them in succession. Theprecipitating tank A has in its top a floor a above which rise thepartitions a and 0. which form a channel a terminating in the outlet (1Floors or, and a extend from thesepartitions downwardly to the outerwalls of the tank to form channels communicating with the channel a,these floors having the restricted openings a and a in the outerportions thereof. Rifile boards a rise from the floors a to baifie thechannel, forming the compartments (1 and a; the boards being inclined sothat they form with the walls and floors acute trihedral anglesextending in the direction of flow. Depending from the said floors arepartitions a and a which form the compartments a), a" and a, thepartition (1, having therein the notcha At the bottom of this tank is afloor composed of the sections a, a, 0i and (L23 which extend inwardlyand downwardly to the outlet 0. and form a basin whose walls are pitchedbeyond the angle of repose of the fiber. The settling and storage tank Bis provided with a bottom composed of the sections b 19 b and b whichextend inwardly and downwardly to an outlet 1) and form a basin withwalls itched beyond the angle of repose of the 'ber. The supply tank Cis provided with a bottom having the sections 0 ,0 0 and c inclinedinwardly and downwardly to the outlet 0 the basin thus formed havingwalls pitched beyond the angle of repose of the iiber.

A coagulating trough D connects the tank A with the tank B, having aninlet d in the form of a weir communicating with the top of the tank Aand an outlet d in the form of a weir communicating with the tank B. Thetank B overflows into the tank C. The white water, or liquid containingsolids, is delivered by a pipe e to the compartment 0., whence the bulkof it flows through the compartments 0. and the channel a to the outleta which delivers it to the compartment o the baffies 00 causing theprecipitation of solid matter, which is carried downwardly through thefloor and along'the tank walls to the basin by the currents flowingthrough the holes a and a". The comparatively large volume of water inthe compartments a, a" and e is comparatively still and solids containedtherein are deposited and collected in the basin, diverging currentsbeing induced by the escape of the clarified water through the weir dand the coagulated matter through the pipe f, such matter being returnedfor incorporation in the process of manufacture. The clarified water isdelivered to the trough D, which may contain alum or other coagulant foreffecting further clarification, and flows thence into the tank B,whence it overflows into the tank C. Subsidence and further depositionof any solids that may remain is effected in these latter tanks,particularly the tank B, and the lower strata containing any solidmatter may be drawn off through the respective pipes g and h andthereafter the clarified water is discharged through the same channelsbut preferably'throu 'h the pipe h, the different strata of different 0iaraeter being diverted to their a propriate use. It will be understoodthat tl ie water which overflows from. the tank B into the tank 0 isusually free of solids and this is intended and drawn for use at anystage of the process of manufacture where clear water is desired. Thevalved outlets 'i provide means for testing the contents of the tanks.The pipe serves to return for storage water of suitable characterdirectly to the tank B. The pipe 7c having branches is and the pipe Zhaving branches Z are used for washing down and draining the tanks andtrough.

Having described my invention, I claim 1. In apparatus of the classdescribed, a tank having a channel containing riflie boards, acompartment or compartments into which. said channel discharges, meansfor drawing precipitated matter from the bottom of said compartment orcompartments, and means for draining off the clarified liquid in saidcompartment or compartments from the u per strata thereof.

2. In apparatus of the class described, a series of communicatingcompartments separated by rifi'le boards forming a baflie'd channel, aplurality of communicating compartments separated by one or morepartitions forming a baffled chamber, said compartments last named beingbeneath and receiving the discharge from said first compartments, meansfor drawing oil precipitated matter from the lower strata of saidchamber and means for drawing ofi' liquid from the upper strata of saidchamber.

3. In apparatus of the class described, a series of compartments havinginclined bottoms with holes therein and inclined partitions, incombination with a settling chamber beneath said compartments.

4. In apparatus of the class described, a channel having an inclinedbottom with holes therein, inclined rifiie boards forming compartmentsin said channel, an open channel into which. said channel first nameddischarges, and a settling chamber into which said channel last nameddischarges.

5. In apparatus of the class described, a channel containing riiiieboards, a settling chamber beneath and to which said channel discharges,said chamber having a bottom with inclined walls, and means fordischarging said chamber through said bottom.

6. In apparatus of the class described, a tank having means forcirculating and baffling a liquid, means for inducing diverging currentsand separately discharging the upper and lower strata of the contents ofsaid tank, and a second tank connected and receiving the overflow fromsaid first tank.

7. In apparatus of the class described, a tank having means forprecipitating solids from liquids with outlets at the bottom and topthereof for withdrawing respectively precipitated matter and lir uidfrom which it is precipitated, a coagiilating compartment into whichsaid liquidv is discharged from said tank by said top outlet, and asettling and storage tank into which said coagulating compartmentdischarges.

8. In apparatus of the class described, a tank havingnieans forcirculating and batfling a liquid to e'll'ect precipitation of solidstherein, said tank having a lower outlet for discharging solids and anupper outlet for discharging liquid, a trough into which said tankdischarges liquid through said outlet, a settling and storage tank intowhich said trough discharges, and a supply tank into which said settlingand storage tank overflows.

In witness whereof I have hereunto set my name this 13th. day of August,1907, in the presence of the subscribing witnesses.

JOSEPH M. DOIIAN. l/Vitnesses:

CHARLES N. BUTLER, ROBERT JAMES EARLEY.

